I was on 2.0-Release for 720 days before upgrade to 2.1-Release (for IPv6 and CARP cluster). It is on a Supermicro server. Running solid!!!

That's a nice run! I've avoided updates, upgrades, as many changes as possible, disabling NAT reflection on any UDP traffic like DNS, keeping the fans and mb clean, good equipment room temp, stable power, and no log writing to flash.